Brent crude settled at $100.65 a barrel on Thursday, up about 7 percent - its first close above $100 since late May [1]. US crude settled near $92.19, and oil is up roughly 30 percent this month alone [1].
The threshold matters more than the increment. One hundred dollars is the level at which oil stops being a market quote and becomes a household cost, feeding into gasoline, diesel, shipping rates and airfares within a few weeks [1]. It is the number that reorganizes an economy's politics, and the war just crossed it.
Three pressures pushed it there at once. The Strait of Hormuz, where tankers have been struck and set ablaze, is one contested chokepoint [2]. The Houthi blockade of Bab al-Mandeb, which drew its first Saudi-tanker blood overnight, is now a second - and a combined closure of both straits would touch roughly a quarter of the world's oil and gas [2].
The third shock came from outside the Gulf entirely: Kazakhstan halted crude exports through the Caspian Pipeline Consortium terminal after drone attacks [3]. A war centered on the Gulf is now pulling supply off the board on a different continent.
The war's cost has been counted in strikes, in eighteen American dead, in a $67 billion supplemental request. Tonight it has a fourth figure, the one most people will actually feel: a barrel above $100, and a pump average near $4, with the war premium now priced into every gallon [1][2].
